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area = π x radius2

→ radius =√(area/π)

circumference = 2 x π x radius

= 2 x π x √(area/π)

= 2 x √(area x π)

= 2 x √(121 cm2 x π)

= 22 √π cm

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Q: What is the exact circumference of a circle with an area of 121 cm2?
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